Kangil Kim

Gwangju Institute of Science and Technology

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i-10 index

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Bob McKay

Australian National University

Junhyug Noh

Ewha Womans University

Seung‐Hoon Na

Chung-Ang University

Sangmin Woo

Korea Advanced Institute of Science and Technology

Yong Cheol Hong

Korea Institute of Fusion Energy

Ohyung Kwon

Korea University of Technology and Education

Hee-Jun Jung

Gwangju Institute of Science and Technology

Young-Kil Kim

Electronics and Telecommunications Research Institute

Jong-Hun Shin

Electronics and Telecommunications Research Institute

Xuan Hoai Nguyen

Carnegie Mellon University

Cooperative Institutions

Seoul National University

Gwangju Institute of Science and Technology

Samsung (South Korea)

Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Yonsei University

Seoul National University Hospital

Chungnam National University

Korea Institute of Fusion Energy

Jeonbuk National University

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Durable 12‐arm resistive cross‐dipole for use in ground‐penetrating radar

Electronics Letters (2017)

Eonsu Noh Jihan Kang B. Kim Soon-Ho Choi Kangil Kim

A 12‐arm resistive cross‐dipole antenna is proposed and implemented using planar resistor technology (PRT). To improve the quality of the radiated pulse, the arms are loaded with a profile that is modified from the conventional Wu–King profile. The antenna is implemented with no soldered resistors. Thus, the mechanical vulnerability of the conventional resistive dipoles is resolved. The performance of the antennas implemented using a standard printed circuit board and the PRT is shown to be essentially the same. The performance of the antenna implemented using the PRT as a ground‐penetrating radar antenna is also demonstrated by scanning over buried targets.

Resistive touchscreen

Ground-Penetrating Radar

10.1049/el.2017.1489

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Citations (1)

Implementation of Six-axis Inertial Measurement Unit on a Stretchable Platform Using �gCut-and-Paste�h Method for Biomedical Applications

Sensors and Materials (2019)

Kangil Kim Sangmin Lee

Wearable devices that can process and transmit signals from the human body have the potential to provide valuable biometric data for mobile health (mHealth) and human-machine interface (HMI).Among recent advancements in flexible and stretchable electronics, epidermal electronic devices have shown major breakthroughs in wearable device research fields.Epidermal systems, such as tattoo-and patch-type stretchable systems, have conformity to the human skin, which can be deformed with the skin without detachment for fracture.In this paper, the implementation of a six-axis inertial measurement unit (IMU) on a stretchable platform for applications in wearable electronics is presented.The proposed device is implemented using circuit elements on a patchlike substrate to collect accurate data from the human body.To achieve flexible and stretchable characteristics of the device, a serpentine interconnection is adopted between the circuit elements.Instead of a microfabrication process, a low-cost, dry, and freeform "cut-and-paste" method that uses a thin metal sheet and a cutting tool to fabricate complex serpentine interconnections is used to fabricate the substrate.The performance characteristics of the IMU using the proposed method are demonstrated for future application in highly accurate biosensors.

Units of measurement

10.18494/sam.2019.2259

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Citations (3)

An XML Format for Sharing Evolutionary Algorithm Output and Analysis

Lecture notes in computer science (2010)

Dharani Punithan Jerome Marhic Kangil Kim Jakramate Bootkrajang Bob McKay

Schema (genetic algorithms)

10.1007/978-3-642-17298-4_41

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Citations (1)

A wireless multimedia LAN architecture using DCF with shortened contention window for QoS provisioning

Kanghee Kim Aftab Ahmad Kangil Kim

In this paper, we propose a MAC architecture for IEEE 802.11-like WLANs supporting multimedia services. The main characteristics of the proposed MAC procedure are the period restriction and DCF/SC (distributed coordination function with shortened contention-windows) instead of the PCF (point coordination function) of the IEEE 802.11 standards. We investigate the performance of the proposed MAC mechanism in terms of utilization, throughput, latency and jitter under two multimedia network environments considered by the IEEE 802.11-task group E. These environments are home and enterprise. In the simulated performance, this novel approach, which preserves the traffic classification but increases the channel utilization, thus guarantees QoS (quality of service) of multimedia traffic.

Distributed coordination function

Wireless Multimedia Extensions

IEEE 802.11e-2005

Provisioning

IEEE 802.1X

10.1109/wcnc.2003.1200562

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Citations (1)

Improving LSTM CRFs using character-based compositions for Korean named entity recognition

Computer Speech & Language (2018)

Seung‐Hoon Na Hyun Kim Jinwoo Min Kangil Kim

CRFS

Named Entity Recognition

Representation

Sequence labeling

10.1016/j.csl.2018.09.005

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Citations (27)

An estimation of traffic parameters for VBR services in ATM networks

Computer Communications (2001)

Jae-Woong Paek Chang Hwan Oh Kangil Kim

10.1016/s0140-3664(00)00324-8

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Citations (1)

Implicit bias and recursive grammar structures in estimation of distribution genetic programming

Kangil Kim Hoai Nguyen Xuan Bob McKay

Much recent research in Estimation of Distribution Algorithms (EDA) applied to Genetic Programming has adopted a Stochastic Context Free Grammar(SCFG)-based model formalism. However these methods generate biases which may be indistinguishable from selection bias, resulting in sub-optimal performance. The primary factor generating this bias is the combined effect of recursion in the grammars and depth limitation removing some sample trees from the distribution. Here, we demonstrate the bias and provide exact estimates of its scale (assuming infinite populations and simple recursions). We define a quantity h which determines both whether bias occurs (h >; 1) and its scale. We apply this analysis to a number of simple illustrative grammars, and to a range of practically-used GP grammars, showing that this bias is both real and important.

Formalism (music)

Sample complexity

10.1109/cec.2012.6256565

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Citations (0)

Statistical properties analysis of real world tournament selection in genetic algorithms

Applied Intelligence (2007)

Sungbae Lee Sang-Moon Soak Kangil Kim H. Park Moongu Jeon

Tournament selection

Benchmark (surveying)

Tournament

Fitness proportionate selection

10.1007/s10489-007-0062-2

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Citations (54)

Effect of pre-training to build a regression model using shallow neural network for semiconductor plasma etch process equipment

2021 IEEE International Conference on Big Data (Big Data) (2020)

Ohyung Kwon Nayeon Lee Kangil Kim

Plasma etch process is one of manufacturing steps to fabricate semiconductor chips and the difficulty of etch process has become harder and harder because the target specifications of chips have become harsher. To overcome this circumstance, monitoring plasma parameters in real-time has been requested. In this study, regression models to predict a plasma density from the intensities of optical wavelength obtained from plasma etch process chamber using shallow neural network were presented. The estimation results of several models with or without pre-training were also analyzed. The model using variational auto-encoder showed the best performance and it can expect to be easily accepted in semiconductor industry because optical intensity measurement device was already equipped for plasma etch process chamber.

Semiconductor device fabrication

Plasma Etching

Semiconductor Industry

Semiconductor device modeling

10.1109/bigdata50022.2020.9378316

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Citations (1)

Forward error correction with RaptorQ Code on embedded systems

2022 IEEE 65th International Midwest Symposium on Circuits and Systems (MWSCAS) (2011)

Todor Mladenov Kangil Kim Saeid Nooshabadi

Raptor code, a member of the rateless fountain codes family, has been a preferred technology for the forward error correction (FEC) at the application layer. It is used by the 3 ^rd Generation Partnership Program (3GPP) Multimedia Broadcast/Multicast Service (MBMS) and Digital Video Broadcasting (DVB-H) standards for multimedia broadcast and content delivery. Currently, a next generation fountain code, called RaptorQ, is being proposed. It aims at reducing to a minimum the redundant FEC information, outperforming significantly Raptor code. The improved coding performance comes at the expense of increased encoding and decoding complexity. This paper compares the coding properties, the decoding performance and the energy efficiency of the two codes on embedded system. Furthermore, simulations are performed for a practical MBMS scenario. Finally, conclusions are drawn with respect to the applicability of the new code for realtime multimedia broadcasting and content delivery.

Fountain code

Raptor code

Forward error correction

Unicast

Digital Video Broadcasting

10.1109/mwscas.2011.6026424

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Citations (14)